	#define _CRT_SECURE_NO_WARNINGS
	#include<stdio.h>
#include<math.h>





/*
	int Fun(n)
	{ 
		if (n <= 2)
		{
			return 1;
		}
		else
		{
		return  Fun(n - 1) + Fun(n - 2);
		}
	}





	int main()
	{
		int n = 0;
		scanf("%d", &n);
		int ret = Fun(n);
		printf("%d", ret);
		return 0;
}*/




int main()
{
	int x = 15;
	float y = sqrt(fabs(sin(45 * 3.14 / 180) + 5.0 / 8)) + log(x) / (x * log10(x));
	printf("%.3f", y);
	return 0;
}